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Reason behind the rapid wear of brushes is __________

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in DC Machines by (506k points)
Reason behind the rapid wear of brushes is __________

(a) Abrasion from dust

(b) Excessive spring pressure

(c) Rough commutator bars

(d) Abrasion from dust, excessive spring pressure and rough commutator bars

I had been asked this question by my school principal while I was bunking the class.

My enquiry is from Brushes and Commutator Assembly in section DC Machines of DC Machines

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Best answer
Correct option is (d) Abrasion from dust, excessive spring pressure and rough commutator bars

To explain I would say: Brushes undergo various forces due to their location in a DC machine, they are in contact with rotating and stationary part of the machine. Hence, rough contact between commutator and brushes, inappropriate pressure on brush to rotating part may affect quality of commutation process.

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